Necessary to the Islamic Republic of Iran toward the favorable legal system arising from the teachings of the Sharia is to discover strategies in the Constitution. One of the existing structures in the legal system of Iran which is essential to be redesigned and improved based on the religious teachings is the structure of the legislature. Accordingly, the main question of this research is to present the strategies set forth in the Constitution so as to reform the legislative system in this regard. This paper seeks to answer the mentioned question through a descriptive-analytic research by using the library method. Regarding to the capacities of the general policies of the system, including its status in the hierarchy of laws and obligatory implementation of the general policies, it would benefit from these policies in order to realize the regulatory Ijtihad as a part of the favorable Islamic legislation.